ittikorns commented on issue #1587: Installation URL: https://github.com/apache/incubator-pagespeed-ngx/issues/1587#issuecomment-447044180 For those who encounters `/dev/fd/63: line 625: -1: substring expression < 0` Try replace the Line 625 `nps_module_dir="$BUILDDIR/${nps_module_dir::-1}"` with `nps_module_dir="$BUILDDIR/${nps_module_dir}"`
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